Java Fundamentals, Part 1 1 http://mipav.cit.nih.gov
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Java Fundamentals, Part 1
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http://mipav.cit.nih.gov
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MIPAV TeamEmployees
Ruida Cheng
William Gandler
Matthew McAuliffe
Evan McCreedy
Justin Senseney
Fellows
Sara Shen
Contractors
Alexandra Bokinsky, Geometric Tools Inc. (Visualization)
Olga Vovk, SRA International Inc. (Technical Writing)
Alumni
Paul Hemler, Agatha Munzon, Nishith Pandya,
David Parsons, Beth Tyriee, Hailong Wang
Medical Image Processing, Analysis & Visualization
&JAVA
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Justin Senseney
Biomedical Imaging Research Services Section (BIRSS)
Imaging Sciences Laboratory
Division of Computational Bioscience
Center for Information Technology (301) 594-5887
http://mipav.cit.nih.gov
http://dcb.cit.nih.gov/~senseneyj
Mipav Interface
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• Interface to Java• Interface to image processing libraries
Java Steps
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• Methods
• Comments
• Printing
• Data types
• Equality
• If
• Loops
• Switch
Method
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private void init() { setForeground(Color.black); setTitle("Generic Plugin 5.4.2"); try {
setIconImage(MipavUtil.getIconImage("divinci.gif"));} catch (FileNotFoundException e) { Preferences.debug("Failed to load default icon", Preferences.DEBUG_MINOR);}……
Visibility
Return type
Comments (1)
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private void init() { setForeground(Color.black); /*setTitle("Generic Plugin 5.4.0"); try {
setIconImage(MipavUtil.getIconImage("divinci.gif"));} catch (FileNotFoundException e) { Preferences.debug("Failed to load default icon", Preferences.DEBUG_MINOR);}*/……
Comments (2)
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private void init() { //setForeground(Color.black); setTitle("Generic Plugin 5.4.2"); try {
setIconImage(MipavUtil.getIconImage("divinci.gif"));} catch (FileNotFoundException e) { Preferences.debug("Failed to load default icon", Preferences.DEBUG_MINOR);}……
CTRL+shift+C when all lines are highlighted
Print data
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private void init() { System.out.println(“Hello world”);
……
Shown in console
Data types
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private void init() { int a = 16;
double b = 16.0;
String str = " test "; boolean isEqual = false; System.out.println(a+str+isEqual);
Equality
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private void init() { int a = 123; int b = 321; boolean isEqual = (a == b); boolean isEqual2 = (a != b); System.out.println("A: "+a + "B: " + b + isEqual + isEqual2);
Usability
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private void init() { String str = " test "; String str2 = " te2st "; boolean isEqual = (str == str2); //Are these two equal? boolean isEqual2 = (str != str2); //Are these two different? System.out.println(str+str2+" Equal: "+isEqual+" Not equal: "+isEqual2);
Review
• Method
• Comments
• Print data
• Data types
• Equality
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Method – make your own
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private int myAddMethod(int initial) { initial = initial + 1; return initial; } private void init() { int a = 10; int b = myAddMethod(a); System.out.println("A: "+a+" B: "+b);
Visibility Return type Input
If statement
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private int myAddMethod(int initial) { if(initial < 10) { initial = initial + 1; } else { initial = initial + 2; } return initial;}
Else If statement
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private int myAddMethod(int initial) { if(initial < 10) { initial = initial + 1; } else if(initial >= 10) { initial = initial + 2; } return initial;}
While loop
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private int myAddMethod(int initial) {
while(initial < 100) { initial = initial + 1; } return initial; }
Boolean ending condition
For loop
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private int myAddMethod(int initial) {
for(int i=initial; i < 100; i++) {System.out.println(i);
} return initial;}
Loop’s private variable
For loop
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private int myAddMethod(int initial) {
for(int i=initial; i < 100; i++) {System.out.println(i);
} return initial;}
Action occurs at end of each iteration
For loop
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private int myAddMethod(int initial) {
for(int i=initial; i < 100; i++) {System.out.println(i);
} return initial;}
Boolean variable checked before each iteration
For loop quiz
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private int myAddMethod(int initial) {
for(int i=initial; i < 100; i++) {
initial = initial + i; } return initial;}
Given initial = 10
What is final value of initial?
Switch/case
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private int myAddMethod(int initial) { switch(initial) { case 1: case 2: case 3:
initial = 4; break;
default:
initial = initial+1; break;
} return initial; }
Break shows to exit switch
Review
• Creating methods
• If/Else if
• While
• For
• Switch/case
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Quiz 1 - Evaluate
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private boolean myMethod(int initial) { if(initial < 100) { return true; } else { return false; }} private void init() { boolean a = myMethod(99); System.out.println(a); System.out.println(myMethod(101)); System.out.println(myMethod(100));
Quiz 2 - Evaluate
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private int myMethod(int initial) { int done = 0; for(int i=0; i<=initial; i++) { done = done + i; } return done; } private void init() { System.out.println(myMethod(10)); System.out.println(myMethod(0)); System.out.println(myMethod(-1));
Quiz 3 - Evaluate
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private int myMethod(int initial) { if(initial < 0) { return 0; } else { return initial+myMethod(initial-1); } } private void init() {
System.out.println(myMethod(1));
System.out.println(myMethod(2));
System.out.println(myMethod(10)); System.out.println(myMethod(-1));
Task - Write
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• Method to compute average of two numbers
• Method to print out whether a number is even
• Method with infinite loop
Summary
• Java primitive types
• Java loops
• Java methods
• Fundamentals
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Next time
• Java arrays
• Java API
• MIPAV API
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Visualization
File readerQuantification File writer
Processing Macros
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